Journal article
Genetic variation in survival of tilapia (Oreochromis niloticus, Linnaeus, 1758) fry during the early phase of rearing in brackish water environment (5–10 ppt)
Aquaculture, Vol.442, pp.112-118
2015
Abstract
Tilapia fry viability is one of the important traits because it affects number of seed produced and marketed and, therefore, yield and economic return for hatcheries and the aquaculture industry. In the present study, we examined the effect of female body weight prior to spawning and fry birth weight on survival rates at 20 days of nursing (D20) and at 62 days (D62) (when tagged). Genetic parameters for D20 and D62 were estimated from 86,609 individual fry which were offspring of 63 sires and 77 dams in the sixth generation of a Nile tilapia (Oreochromis niloticus) population undergoing selection for high growth in brackish water environment. Both linear and threshold models were used to estimate genetic parameters for these two traits. The estimates of heritability for D20 after hatching were low and not significantly different from zero across the models studied. By contrast, D62 showed a large heritable additive genetic component on both the liability and observed scales (h2 = 0.24 - 0.79). The maternal and common environmental effects were 6 - 12% for survival at 20d (D20), whereas they were small for survival from 21d to tagging, D62 (1 - 5%). Genetic correlation between D20 and D62 was high and positive (0.72±0.06). However, the estimate was significantly different from one which suggests that D20 and D62 are under different genetic control and should be treated as different traits in selective breeding programs for tilapia. The results from the present study indicate for the first time that there is potential for simultaneous improvement of both survival rates at 20 days of nursing and at tagging in the future genetic improvement program for this tilapia population.
Details
- Title
- Genetic variation in survival of tilapia (Oreochromis niloticus, Linnaeus, 1758) fry during the early phase of rearing in brackish water environment (5–10 ppt)
- Authors
- Thoa Ngo Phu (Author) - University of the Sunshine Coast - Faculty of Science, Health, Education and EngineeringWayne R Knibb (Author) - University of the Sunshine Coast - Faculty of Science, Health, Education and EngineeringNguyen Huu Ninh (Author) - Research Institute for Aquaculture, VietnamNguyen Van Dai (Author) - Research Institute for Aquaculture, VietnamPham Hong Nhat (Author) - Research Institute for Aquaculture, VietnamLe Minh Toan (Author) - Research Institute for Aquaculture, VietnamNguyen Hong Nguyen (Author) - University of the Sunshine Coast - Faculty of Science, Health, Education and Engineering
- Publication details
- Aquaculture, Vol.442, pp.112-118
- Publisher
- Elsevier BV
- Date published
- 2015
- DOI
- 10.1016/j.aquaculture.2015.02.040
- ISSN
- 0044-8486
- Copyright note
- Copyright © 2015. This manuscript version is made available under the CC-BY-NC-ND 4.0 license http://creativecommons.org/licenses/by-nc-nd/4.0/
- Organisation Unit
- School of Science and Engineering - Legacy; University of the Sunshine Coast, Queensland; School of Science, Technology and Engineering; Centre for Bioinnovation
- Language
- English
- Record Identifier
- 99450198502621
- Output Type
- Journal article
Metrics
1607 File views/ downloads
1891 Record Views
InCites Highlights
These are selected metrics from InCites Benchmarking & Analytics tool, related to this output
- Collaboration types
- International collaboration
- Web Of Science research areas
- Fisheries
- Marine & Freshwater Biology